A156294 Sum of products of the digits of prime numbers and the position of the digits in the prime numbers.

2, 3, 5, 7, 3, 7, 15, 19, 8, 20, 5, 17, 6, 10, 18, 11, 23, 8, 20, 9, 13, 25, 14, 26, 23, 4, 10, 22, 28, 12, 26, 10, 28, 34, 36, 14, 32, 22, 34, 24, 42, 20, 22, 28, 40, 46, 7, 15, 27, 33, 17, 35, 13, 15, 33, 23, 41, 19, 37, 21, 27, 29, 24, 8, 14, 26, 12, 30, 32, 38, 22, 40, 36, 26, 44

Offset: 1

Author

Cino Hilliard, Feb 07 2009

Keywords

• base
• nonn

Examples

			For n = 5, prime(5) = 11 and A156207(11) = 1*1 + 1*2 = 3. So, a(5) = 3. - _Indranil Ghosh_, Feb 11 2017
		

Links

• Indranil Ghosh, Table of n, a(n) for n = 1..50000

Programs

Mathematica

Table[Total[IntegerDigits[#] Range@ IntegerLength@ #] &@ Prime@ n, {n, 75}] (* Michael De Vlieger, Feb 11 2017 *)

PARI

g(x) = local(v,j);v=Vec((Str(x))); sum(j=1, length(v), j*eval(v[j]))
g1(n) = local(j);forprime(j=1,n,print1(g(j)","))

Formula

a(n) = A156207(prime(n)). - R. J. Mathar, Sep 10 2016